"I have just had the same problem - I schedule something weekly and have done exactly the same as normal and have the post just cant preview it once scheduled so guess its just a general issure that hopefully will be sorted - I had contacted wordpress on the contact us page - so maybe it will all be clear soon"

I've been on WordPress.com for almost 2 years using Firefox the whole time. I'm never had a problem previewing a post that was in draft or scheduled stage.

I don't have chrome installed on my computer and I seriously doubt that's the problem. I could be wrong of course, but seems like something else is up if more than one person is having the problem.